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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7ae0b99e533cfb1b4df13b0848686bdf966c6fa72a93e9fc06c1338d6db6b4' 
  AND token = 'BlnBiyn2ZuYMPFhdhcmB85kyQ80cSRKq/s9O27Q3450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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