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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93ef2fa0e4f96fccf8504b5a8f33169a09f8ab2962072e7055d96e923e4c8a7' 
  AND token = '9VnDYsJDunNjGXL5GVgmGMgE0aH8sJadzXTxNzGlEsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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