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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8cb1be6f1c235cc4dbdfd3adae74086e9969f9772ab20d4c81a2530a33f650' 
  AND token = 'qcH8iywfJjMJtfKdBn8Yi5D0l2SywRdVoZPB62EDMQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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