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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095a34ef369e3ff7cf345d4c24ab3870e17b252a49c683e50c2b99ec22fbd7a5' 
  AND token = '5HUj/U/vFDESvSH4SSBV3kBec6zW2AwVAfc9ar1T238=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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