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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7512d7a29931a2a4c8e69af738ff1e646cbccd902f16cd710f3a1afb78769ff' 
  AND token = '+vBgey/lECnn79m9PGy14uOQpGgkZ8NUFM+poREerAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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