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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba47f91484896aa9a263e44d35f71467f10b4d85014880c2da5486c361e6d2d' 
  AND token = 'jhBvNDjmf0Gi8nyp8Rm9M0FHYM7AUll9OJs4X/SklkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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