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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c01e829e207cc9a2d172259695de1598567e3eea38d829a7e711047dcb2f682' 
  AND token = 'jJWLvQFzT1AMfJpYuxCaIC6uO1u4sBJijUfd9p22yJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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