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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec25ebf34572eb8c3f959f2e4365153a9640b1ea275dbd4d835ed7d1c190eb5' 
  AND token = 'EwzcIJFvq3c+uX9oqufUVdEOdIO+iQlrdtY4edwokpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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