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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7877dfb16d7f8b186346cd338e0c6a4406fb4ea3132bf778e0802224d17efc29' 
  AND token = 'IgfiyWkyRfytqCFGqZNjj39C2HwIkPMbdEyp+RjMNVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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