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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e1f60e1aa416dd4fa64d458c627de11a3f7f164fd168c90a8dec5f0896c6ba' 
  AND token = 'fyEM9kueixYdY4s6lEOtyqTMPrWLg0rdH9RP0g5PUxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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