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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2deb8547e5f63c8d95368749cef49be8f21b7641e2d7fd30f2e468986611e3b2' 
  AND token = 'vVAObsCxDcUtIbiZi2skIDGDgvZ+6JupdAD1/EqBrXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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