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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8b364ea05a0e3658d1a0f49fb174f80218853055911fb5ec6c2e550581a883' 
  AND token = '6wvhSLXpOl1RVQpaN+XSYdZqOLmto8Iy0jxQYdR/lVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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