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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab0e2604a70820dfc0d1e23cd222b1f5c020069d9ab2c8430d395fb58df60ff' 
  AND token = 'Z1SFNP8WydorgxValjovXFSBRFt7bkYyXlMpiJuHW7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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