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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae93de4e4367e4274a24be63949f5dadc93c34566f11a23adab941c9eeb813a' 
  AND token = 'H1kr+4DqYvTEGn3iLEVfJ9nNiiuDDLAo58IKLVmonp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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