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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6ad5c6b0db70372ee445f1bb68710f2cda7389cf7952b860d49d0eef68b92' 
  AND token = 'T80AE32VhvNIHUsjfE5a0J13vLSVqlKQVIvHNi2v5AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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