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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17e7e32188a00df239d18a3b80591c16c7b67a13ad8ebbd6b11dae074fa61ac' 
  AND token = 'xlC0a0lcFi2Z5jp1PsM49kr1uUKISKSgOILscckjMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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