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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ecf7d4e8a7927d252bf9126b3aadfd96ea5e168cc8805158a387cad21067f4c' 
  AND token = 'K59Ngz9fGz55xq4/GGjRoO7ut3fSaSNPctf4OGtwuUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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