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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f3f77aa9d9ea2964efc60b9c1e3d3a0ecdec97c173ad00f574f642c6f7ff38' 
  AND token = 'uy4rytPkC4KrAUNa8orb5pi41Tco2WD2nhw8kMct1J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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