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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb04524da2fe419d4a82d4dda23a592d0b3b80327d2ffa71b93bd0040a99162d' 
  AND token = 'ZHrUfUcdfuR+tgiJALWXA68ZLDizu2SD35BWMIWoDlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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