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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba7cc9d77581803ea727b7dded4a5f88f050d368865632b8e82386cfdc39b66' 
  AND token = 'o8V5kO8xPsaAZ+qbcM5shqFkTgGejYTQX/VeBgcIIhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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