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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb98540832353dc7d20f8f86da45b2ef7562d20e9721bc0a8e0b80703d54c55' 
  AND token = 'IFzS4JoeWnT8QKYMb2Zw7zYTMfx13EMOeU06zyrv12A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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