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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20e630d8c91cfe3badea61b556cc26034997cf2df2243004387192a5c2f865e' 
  AND token = 'DyiL6DTAyebn+Z5aoGvQqc+H9v1bJL+9JMkJwPV5vwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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