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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f928e629e75455d55458d0225b6ef40e6fbbebe0037247f09eb955ab0ce0be5' 
  AND token = 'OGYEOjvJY3A/qkCxvnmqcxx3rDT3A0ero8SKydzGnKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}