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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1238bb796437a763bf6d032425de1bfc6e9506aa20be431adc81a180990d3ce' 
  AND token = 'KMgYugfQM+CM9GQT6VRA9dgKI9NEnaZ3S3TLQIFV4Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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