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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d76889a9a5e9fe924052834ca068fbc26e0c159f366972cb7f5daf1e0f9ac6' 
  AND token = 'vHbqxwPWNmWf7yqMtrHEcpvWwRI9effSsSXhEl+z4bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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