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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06750c35e7588d16371ca3a0d828236e92fd85d423bdd8f56237eed388825c7' 
  AND token = 'caDPryC8Ou5zx6opXcQAZpOilKipBdVxE3gn04rYlNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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