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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3e772410e93ecb4be19b1a0a2de807de54626fc7578d848bb4d4a23a6ec2eb' 
  AND token = '4EAZGWyBJMFJyKXfYgmVZpHfWXTrP1o4wn0JD5QKBz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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