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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fccdd4f22d210caf3af087d858b37ec7663a2e309216cb73924df37e4dc828' 
  AND token = 'xtg/qsb0FrCUeFcnjnpa6lySPNu2uFmYD3CubyQ6V+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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