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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fb89cd1b98cc259dea3375ac428a128d1eb2ac25409030e48157dc8dd3c8c7' 
  AND token = 'lH2FPFCVOmFuGLbW0Wr95U1dZKbRhCx4hushIAjc3wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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