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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44237956a8accff2d3f60f1e2b73c2db4245e1e2e62081e60c616e565644f96a' 
  AND token = 'xigDjemNta1DnR69lTIMKvPKGxANiCwcIZaoXnkH7i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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