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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d65c7970d6eec20f39e63ea6e85d2ef16c559efead4e8f74fac8756ae7cd96' 
  AND token = 'qE3ovMp5LszgwJSCicsr8Ee6AFMV8ePIbEtQrsswb+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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