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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ca342e166117f944d3e44483be896c3f4851fd2d1ff946488dff59c26b691a' 
  AND token = 'IVtW/ldEq9W80LmANDSVbeUy6n8e38LzPhbAbiKaLPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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