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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db334cd2b90f4b2bd6c320f35b33752a832ebfcc82ecad97042be4e4cadff20' 
  AND token = 'yWZwdLrMOCgnrafegI2d4H24diOi6+T3Jzu+RYAOCFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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