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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e566b03bacf4bd2187337cb7cc4a80f1813141534cb3d0533f51feaf1f7f6f3d' 
  AND token = '1kEqw3yucm6tE6u30vp/seULdpaFBra21Nz81CKyX+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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