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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ad9109ee45eede88453c53190cbffffbdd135c199bfc5879da69d402534d6b' 
  AND token = 'hgi5B0Y6RNGDuem+daBDYEcGvltqH9nlMHcdcBCeUPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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