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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9ba3a5b26020d91a57225037aaacc99946d1899f39912ec190f8090c6502f2' 
  AND token = '/VIcaMC9dGAV/hnM/jdow3/XgvW5ZnW7Wy27MjQyVB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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