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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a659d6f6245321cbb2b4a7a5ce69debe9fac6d69b057e6e5e27696554712ec5b' 
  AND token = 'jB8C1zcbTo2fFL68GMw5Beo6JovKReR+RIfZAcEXCts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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