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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a11857eba5fb8f91182e1e6c3f1e16313c2e14bba43ab3cdb74ae3b20b48b4' 
  AND token = 'R9CtZliWDITf3HfIKWwkv4NlYtVpJzjwgTmEQp5lbEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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